Kwikee makes a reasonably sturdy step but if it isn't lubed and sits for long periods, it starts hanging and can start grinding at the joints. Also, if the design load is exceeded, like big guys carrying heavy loads in and out, it does start flexing the metal near the joints and the step gets feeling loose.
Have you been able to crawl under enough to see where it may be flexing? Likely a replacement is the only way to solve the problem unless you have loose bolts under the steps that secure it to the chassis.
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